The process of wrapping and drying the precipitate during an oven experiment involves careful handling to ensure accurate results. After washing the precipitate, gently lift the filter paper using a glass rod. Fold the filter paper in half and wrap the sediment securely inside. Then, press or hold the folded filter paper with the glass rod, and carefully roll it from bottom to top in a spiral manner to transfer it into a crucible that has reached constant weight. Ensure that the three layers of the filter paper are facing upward during this transfer. Before proceeding, check the glass funnel to make sure it is clean. If any residue remains, wipe it with a small piece of filter paper and place it into the crucible as well.
Alternatively, the filter paper can be lifted with the glass rod along with the precipitate, as shown in Figure I. There are multiple methods to handle the precipitate—seven commonly used techniques have been documented. Once the filter paper and precipitate are transferred, place the crucible in a desiccator with the lid left open. Position the crucible upright on a clay triangle, and apply gentle heat to the filter paper. The flame tip should be close but not touching the bottom of the crucible.
In some cases, a reflective flame method can be used for drying. Place the side of the crucible on the clay triangle, and support the bottom of the crucible with a porcelain rod located on the side of the triangle. Tilt the mouth of the crucible toward the right corner of the triangle, and rest the lid at an angle. Adjust the gas lamp flame so that it is positioned beneath the center of the crucible. As the flame heats the crucible, hot air circulates inside, and moisture escapes through the opening at the top. This method ensures even and efficient drying of the sample.
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